Dropped Valve Seat • A dropped valve seat can be due to incorrect insertation of the valve seats. • The correct interference fit should be applied when fitting valve seats, otherwise you could be greeted with scenes like this.

	Flanged Seat Area • A Flanged seat Area is due to incorrect insertation of the valve seats. • If the Heat/Freeze treatments are not carried out on the cylinder head and valve seats then the edges of the cylinder head valve seat locations can become bevelled and pushed down under the valve seat.

	Cracked Cylinder Head Cast • A Cracked Cylinder Head Cast around the valve seats and spark plug hole can be due to incorrect insertation of the valve seats or just the fact that the distance between them are so small especially if oversize valves are fitted.

	Combustion Chamber Corrosion • Combustion Chamber Corrosion can be due water leaking into the combustion chamber through a cracked/porus combustion chamber or a faulty head gasket. • Another cause may be the inlet throat or port leaking water through the intake.

	Cracked Cylinder Head • A Cracked Cylinder Head around threaded holes can be due to the over tightning of the studs. • Silicone or oil trapped within the holes before inserting the studs can cause hydraulic lock pressure, thus splitting the cylinder head.

Engine Block Clogged • The incorrect prohibitors in the Anti-Freeze to stop the oxidisation of the alluminium is the main cause for this problem together with not flushing the engine through periodically. • The Sediment from old water will become dense and fall to the bottom of the waterways.Over many years, This may fill the entire block cooling section restricting the water flow to the liner area and stopping all cooling to the block and liners themselves.

	Engine Block Corrosion • Here (with the engine block cleaned) you can see the result of incorrect anti-freeze's and lack of engine flushing. • Engine Block Corrosion is mainly due to incorrect or lack of anti-freeze.

	Cam corrosion • Corrosion on the cam lobes is mainly due to the lack of lubrication.

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